It started off all right. I get that Mirai was open and honest, trying to find love. He was definitely naive. The problem was that for all this talk about love, there was never any feeling of love. Mirai seemed to just go with the flow, being easily influenced wanting to give others the chance to be loved. The first two guys were just perverts, and the third someone who just wanted to leech off his "purity". Mirai never seemed to expect a mutual love, but rather seemed to feel good about the fact he accepted their abnormal behavior as love. Then there's the seme, so wishy-washy and tepid. As a friend he tries to stop one of the perves in an attempt to save Mirai's honest and pure nature, then feels bad because he felt he shouldn't have butted in. 5 chapters and it was seriously in like the last few pages cupid's arrow inexplicably stikes the seme's heart. It's also the last couple of pages that Mirai is self conscious around him so it must be love, right? I would love to say the feelings were always there, but they were in denial. Can't say that, Mirai is literally an airhead and the seme really just saw him as a cute innocent friend. Sincerely disappointing. Would have needed at least 3 more chapters to make the story work.
Itoshi no Mirai-kun